1College of Environmental Ecology，Jiangsu Open University，Nanjing 210017，Jiangsu，China；2Institute of Agricultural Resources and Environment，Guizhou Academy of Agricultural Sciences，Guiyang 550006，Guizhou，China；3Institute of Horticulture，Zunyi Academy of Agricultural Sciences，Zunyi 563000，Guizhou，China
Abstract：Taking‘Sijixiaobaicai’as test material，this paper studied the effects of biochar addition at different proportions on the mitigation of cadmium（Cd）toxicity in yellow soil and growth of pakchoi．The results showed that adding biochar could obviously increase the pH value of soil contaminated by Cd，significantly decrease the content of available Cd in soil and reduce its bioaccumulation coefficient，thereby relieving the inhibiting effect of Cd on growth of pakchoi．The addition of biochar could also increase the emergence rate，plant height，root length，fresh weight per plant and dry mass per plant of pakchoi；significantly reduced the Cd content in the plant；inhibited Cd being transported from underground to above ground．In general，adding 10% biochar has the best effect．
